Improvement in asphalt pavements



CARL PETRUS 'ALSING, OF NEW YORK, N.

Letters Patent No. 98,460, dated January 4,1870.

v IMPROVEMENT m ASPHALT ravnmiw'rs.

The Schedule referred to in these Letters Patent and malsing part of thename T 0 all whom it may concern Be it known that I, CARL Pn'rRUsALSING, of the city, county, and State of New York, have invented a newand useful Improvement in Asphalt Pavements; and I do hereby declare thefollowing to be a full, clear, and exact description of the same.

The nature of my invention consists in a compound for asphalt pavement,composed of asphalt, distilled coal or pine-tar, pulverized flint,pulverized oystershells, zinc-white, pulverized bone, and grave].

To enable others skilled in the art to make and use my improvement, Iwill proceed to describe its operation.

The ingredients of which the pavement is com posed are prepared in twoseparate apparatus, one to contain the ingredients which are intended toform the lower or bottom layer, and the other apparatus to contain theingredients forming the upper or top layer of the pavement.

For the bottom layer, may be used coarse asphalt and pine or coal-tar,but for the upper layer, I use a compound of the following ingredients:

Asphalt, thirty-five parts.

Distilled'coal or pine-tar, fifteen parts.

Zinc-white, two parts.

Pnlverized oyster-shells, two parts.

-Pulverized' flint, five parts. Pulverized bone, one part. Gravel, (wellscreened,) forty parts.

The ground on which the pavement is to be laid,-

shonld bedry, level, and covered with a layer of coarse gravel, andcarefully rammed. One hour after the bottom layer is laid, it is readyto receive the upper layer, which may be of any desired thickness,according to circumstances.

The upper layer is levelled with a straight-edge, or any other suitabledevice.

While the-layer is still hot and soft, it is covered with a layer ofgravel of the size of a pea, and in order to prevent the gravel frombeing swept off or becoming loose, it may be pressed down and embeddedin the compound of which the upper layer of the. pavement consists.

The'compound of my asphalt pavement is particnv larly adapted to coverstreets, roads in parks, 850., and neither the tread'of horses nor thewheels of carriages will produce any injurious effect upon the pavement.

The durability of the-composition depends,in a great measure, upon thequality and preparation of the asphalt. 1 Having thus described myinvention,

What I claim as myinvention, and desire to secure by Letters Patent, is

The manufacture or preparation of a compound which is denominatedasphalt pavement, of the intgredients, in the proportions, and for thepurposes set orth.

, In testimony whereof, I have signed my name to 7 this specification,in the'presence of two subscribing witnesses.

CARL PETRUS ALSING.

- Witnesses:

. O. F. OLAUSEN, A. RUPPERT.

